CN100506726C - Steel iron wastewater coagulating sedimentation and filtration treatment system - Google Patents

Abstract

The invention relates to a system of coagulative precipitation and filtering for wastewater in steel industry, especially suitable for wastewater in tail production in steel industry or comprehensive wastewater comprising less than 30% of sewage. The system comprises high-density clarifying tank and filtering tank, and said high-density clarifying tank combines reaction, clarifying and concentration together. There are flocculant reaction area, pre-settling-concentration area and inclined tube separation area, and a flocculating and a pH adjusting tank are installed following it. The filtering tank combines filtering and backwashing together, and it is separated into water distribution area, filtering area, backwashing area and clean water area. The invention overcomes problems of bad effect of precipitation in traditional coagulative precipitation tank, limited control means in normal fast filtering tank, un-thorough backwash, unsealing between cover of movable cover filtering tank and the tank, server device erosion and high operation cost.

Description

Steel iron wastewater coagulating sedimentation and filtration treatment system

Technical field

The present invention relates to a kind of composite wastewater coagulating sedimentation and filtering system, be specially adapted to the comprehensive factory effluent of steel industry or be mixed with the processing of the composite wastewater of 30% following sanitary sewage.

Background technology

Steel industry composite wastewater treatment technology mostly is physics---chemical method, mainly contain according to the process combination difference: flocculation reaction deposition pond+conventional rapid filter, coagulating sedimentation and lime is softening+two kinds in mobile cover filter tank, more than two kinds of process combination because at coagulation, precipitation, the filtering technique aspect is relatively conservative, the pond body bulk is big and the coagulating sedimentation effect is undesirable, particularly the former mainly is applicable to the surface water processing, it is the traditional technology that is used for reducing the water turbidity, and owing to SS in the iron and steel composite wastewater, COD, oil, the content of iron ion etc. is higher, thereby cause follow-up filtering unit normally not play a role, the conventional rapid filter control device is more limited in addition, backwash is insufficient, so processing efficiency is low; Split and the latter's coagulating sedimentation and lime are softening, flow process is tediously long, the structures function division is not obvious, poorly sealed between the cover in mobile cover filter tank and filter grid, equipment corrosion is more serious, causes whole process flow to have some setbacks, overhaul of the equipments rate height, the water outlet qualification rate descends, and influences the backwater quality, even has destroyed the water balance of full factories of Steel Plant.

Summary of the invention

Undesirable in order to overcome traditional coagulative precipitation tank coagulating sedimentation effect, the conventional rapid filter control device is limited, backwash is insufficient, poorly sealed between the cover in mobile cover filter tank, pond, problems such as equipment corrosion is serious, running cost height the invention provides a kind of steel iron wastewater coagulating sedimentation and filtration treatment system.

For realizing that the technical scheme that purpose of the present invention adopts is: steel iron wastewater coagulating sedimentation and filtration treatment system comprise high dense settling pond, filtering basin; The reaction of high dense settling pond collection, clarification, simmer down to one, be divided into flocculation reaction district, preliminary sedimentation-enrichment region, inclined tube disengaging zone, and behind high dense settling pond, set up back coagulation and pH regulator pond, the filtering basin collection filters, backwash is an one, is divided into water distributing area, filtrating area, backwash district, clear water zone.

As further improvement, speed change stirrer in high dense settling pond reaction chamber and the flow deflector can be controlled the speed of stirring, at preliminary sedimentation-enrichment region tapered circulation bucket is set, the enrichment region bottom is provided with bottom mud scraper, and mud scraper has the automatic rake-lifting function, the inclined tube of inclined tube disengaging zone adopts and 60 °～80 ° inclination angles of horizontal direction, and the water leg influent weir is a trilateral, and back coagulation basin is provided with the back coagulation agitator of variable-ratio.The water distribution cell wall of filtering basin is provided with aperture, aperture is arranged horizontally, and be positioned at more than the backwash water surface, the filtering layer of filtering basin is single homogeneous quartz sand filter media, and rising pipe is equipped with automatic adjusting electrically-controlled valve after the filter of filtering basin to the pipeline section of trapped well, it is chain with the preceding liquid level of filter, can realize the filtration of position, Hengshui by adjusting discharge, the back flushing water pipe of filtering basin and backwash gas pipe jointing, three step irrigations of employing " first gas back flushing; gas, water back flushing simultaneously again, last water backwashing ".

Native system with high dense settling pond carry out technological improvement and will improve with the former filtering basin that are applied to water purification plant after again the collocation, reasonable combination, and behind high dense settling pond, set up back coagulation and pH regulator pond, the water distribution structures are set before high dense settling pond, and the water distribution structures have the effect of dosing, hybrid reaction concurrently.The flocculation reaction district is made up of quick stirring region and no stirring region, fast stirring region by speed change impeller control dosing after the stirring velocity of mixing water, no stirring region can promote alumen ustum increase and closely knit even.The sewage that drops into different medicaments is by mixing the flocculation reaction district that the water distribution structures enter high dense settling pond, and adding high molecular polymer, simultaneously, remittance is from the thickened sludge of mud enrichment region, the suspension slime layer that forms high density increases the particle collision chance, pollutents such as active adsorption colloid, suspended substance, oil, COD and BOD.Mud refluxes, and not only can save 10% of added amount of chemical, also can make the suspended sediment concentration in the reaction zone maintain optimum level, thereby reaches the purpose of optimizing flocculation reaction.Under the stirring action of electric mixer flocculation reaction takes place, form big alumen ustum, the sewage that has alumen ustum enters preliminary sedimentation-enrichment region.After sewage after the flocculation reaction entered the bigger preliminary sedimentation-enrichment region of area, the speed that alumen ustum moves slowed down, and made most suspended solids in this zone precipitation and concentrated.Preliminary sedimentation-enrichment region can be divided into two-layer up and down, and one deck is to concentrate active sludge on tapered circulation bucket, is used for refluxing; One deck mainly is an excess sludge below tapered circulation bucket, is used for discharging.The height of tapered circulation bucket can be regulated, the residence time of control mud, thereby control sludge concentration.Mud enrichment region bottom is provided with bottom mud scraper, and excess sludge is scraped into bucket, delivers to the mud system by sludge pump, carries out processed.Remove once more to alumen ustum remaining in the water inclined tube disengaging zone, and primary water enters the back coagulation basin after being collected by water leg, after further reacting and adjusting the pH value, is delivered to the filter tank and carries out filtration treatment.

The filter tank comes water to pass through total distributing flue, (one of them hole can be closed automatically by pneumatic flashboard by two of single pond water inlet square holes again, be called to intersect to sweep and wash the current limliting flashboard) enter single pond distributing flue, enter distributing trough through two side holes again, then by aperture and the overflow of groove top at the bottom of the distributing trough, evenly enter the filter tank, then by water distribution at the bottom of sand filter blanket and the strainer head inflow pond, plenum chamber, importing central air water through the water distribution square hole again distributes in the canal, via filter back water outlet valve, trapped well, effluent weir, the total canal of clear water, wash-down water storage pool in the piping lane, flow into reuse pool at last.

" gas dashes--gas, water recoil simultaneously--, and water dashes " 3 step irrigations are adopted in filter tank among the present invention, and its process is: close filter back flowing water Valve, open the flush discharge valve, reduce that liquid level to drainage tray pushes up in the filter tank; Start gas blower, open intake valve, air water distribution at the bottom of air water distributes the top distribution aperture of canal evenly to enter the filter tank, plenum chamber, spray by strainer head, filter material surface impurity is cleaned and suspend in water, because aperture continues water inlet at the bottom of the distributing trough, the generation lateral surfaces is swept and is washed in the filter tank, pushes impurity to central discharge channel; Start backwash pump, open rinse water valve, empty G﹠W entered air water simultaneously and distributed canal this moment, evenly entered the filter tank through distribution square hole and water distribution square hole and strainer head again, and filtrate is further washed, and lateral surfaces is swept to wash still and proceeded simultaneously; Stop gas and dash, separately water flushing adds that continuing lateral surfaces sweeps and wash, and the impurity that suspends in water is all poured central discharge channel, converges to the back flushing discharge channel, causes pre-treatment balancing tank before the high dense settling pond by pipeline at last.

The invention has the beneficial effects as follows: this system handles iron and steel composite wastewater can reduce equipment corrosion, reduces running cost, and technical process is smooth and easy, guarantees the backwater quality, realizes position, Hengshui, weighing apparatus traffic filtering.

Description of drawings:

The invention will be further described below in conjunction with the drawings and specific embodiments.

Fig. 1 is a system construction drawing of the present invention;

Fig. 2 is the high dense settling pond orthographic plan;

Fig. 3 is an A-A sectional view among Fig. 2;

Fig. 4 is the filtering basin orthographic plan;

Fig. 5 is a B-B sectional view among Fig. 4.

Among the figure: 1, reaction chamber and flow deflector, 2, bottom mud scraper, 3, hold well, 4, effluent weir, 5, back coagulation agitator, 6, inclined tube, 7, water leg, 8, circulation and discharging sludge pump, 9, inclined tube supports, 10, the circulating sludge pipe, 11, the discharging sludge pipe, 12 polymkeric substance add pipe, 13, come water inlet, 14, the back flushing water pipe, 15, distributing trough, 16, the filter tank upflow tube, 17, trapped well, 18, sand filter blanket, 19, the back flushing tracheae, 20, the backwash water shoot, 21, come the water distributing flue, 22, come water water distribution weir, 23, filter plate and filter, 24, high dense settling pond, 25, filtering basin.

Embodiment

Before selecting this steel iron wastewater coagulating sedimentation and filtration treatment system for use, at first by calculating the water yield, analyzing water constituent, water outlet requirement, select suitable coagulation, precipitation load and filtration velocity etc., with various size and the relevant device configuration model of determining high dense settling pond and filter tank.Wherein the included inlet and outlet control valve door in the included circulation bucket of high dense settling pond, mud scraper, inclined tube, overflow weir etc. and filter tank, weir plate, backwashing pump, gas blower etc. are and the design variable matching unit, select different unit types according to different coagulations, precipitation load, filtration velocity.

The agent structure of figure middle-high density settling pond 24 and filtering basin 25 is formed by steel bar concrete casting; High dense settling pond 24 reaction chambers and flow deflector 1 form for carbon steel or Low Alloy Steel Plate processing and manufacturing, be coated with antifouling paste outward, be weldingly fixed on reaction chamber base plate and the perisporium, magnetic stirrer wherein is fixed on the reaction chamber pool wall by service bridge, and it can change its stirring velocity by frequency transformer; Inclined tube 6 is plastics or glass reinforced plastic material, supports 9 by inclined tube and is installed in the high dense settling pond with 60 ° of angles of level; Water leg 7 is weldingly fixed on by two ends on the pool wall of high dense settling pond, and material is a stainless steel; Circulating sludge pipe 10, discharging sludge pipe 11, polymkeric substance add pipe 12, come water inlet 13 etc. to be Welded Steel Pipe, brushing antifouling paste after eliminating rust; Back coagulation basin is formed by concrete casting with high dense settling pond, and the two is as a whole.

The sand filter blanket 18 of filtering basin 25 is made up of the homogeneous quartz sand filter media, and filtrate thickness is relevant with filtration time, backwash intensity, backwash cycle etc.; Backwash tube 14, filter tank upflow tube 16, back flushing tracheae 19, backwash water shoot 20 etc. are Welded Steel Pipe, brushing antifouling paste after eliminating rust; The distributing trough 15 in filter tank, trapped well 17, come water distributing flue 21, come water water distribution weir 22 etc. to be concrete casting to form; The material of filter plate and filter 23 is respectively stainless steel and polymer plastic, is embedded in specified location in the main body concrete construction of filter tank.High dense settling pond is connected by burying the ground welded pipe line with the filter tank, and considers different head loss according to the difference of the two distance.

Can carry out zero load test run and water-filling operation debugging after above structures construction is finished, equipment is in place, roughly process is: come water to enter in the high dense settling pond reaction chamber, flocculation reaction takes place under the stirring of electric mixer behind the medicaments such as adding PAM, after sewage after the flocculation reaction enters the bigger preliminary sedimentation-enrichment region of area, the speed that alumen ustum moves slows down, and makes most suspended solids in this zone precipitation and concentrated.Preliminary sedimentation-enrichment region can be divided into two-layer up and down, and the one deck on tapered circulation bucket is to concentrate active sludge, is used for refluxing; One deck below tapered circulation bucket mainly is an excess sludge, is used for discharging.The height of tapered circulation bucket can be regulated, the residence time of control mud, thereby control sludge concentration.Mud enrichment region bottom is provided with mud scraper, and excess sludge is scraped into bucket, delivers to the mud system by sludge pump, carries out processed.

Remove once more to alumen ustum remaining in the water inclined tube disengaging zone, and primary water enters the back coagulation basin after being collected by water leg, after further reacting and adjusting the pH value, is delivered to the filter tank and carries out filtration treatment.The filter tank comes water to pass through total distributing flue, two water inlet square holes by single pond enter single pond distributing flue again, enter distributing trough through two side holes again, then by aperture and the overflow of groove top at the bottom of the distributing trough, evenly enter the filter tank, then, import central air water through the water distribution square hole again and distribute in the canal by water distribution at the bottom of sand filter blanket and the strainer head inflow pond, plenum chamber, via filter back water outlet valve, trapped well, effluent weir, the total canal of clear water, wash-down water storage pool in the piping lane, flow into reuse pool at last.Filter back washing then is to carry out air water combination back flushing according to the stifled situation of the concrete dirt of backwashing period of setting or filtrate.

Claims (3)

1, a kind of steel iron wastewater coagulating sedimentation and filtration treatment system, comprise high dense settling pond (24), it is characterized in that: the reaction of high dense settling pond (24) collection, clarification, simmer down to one, be divided into flocculation reaction district, preliminary sedimentation-enrichment region, inclined tube disengaging zone, and behind high dense settling pond (24), set up back coagulation and pH regulator pond; Be provided with filtering basin (25) afterwards, filtering basin (25) collection filters, backwash is an one, is divided into water distributing area, filtrating area, backwash district, clear water zone.

2, according to described steel iron wastewater coagulating sedimentation of claim 1 and filtration treatment system, it is characterized in that: the speed change stirrer in high dense settling pond (24) reaction chamber and the flow deflector (1) can be controlled the speed of stirring, at preliminary sedimentation-enrichment region tapered circulation bucket is set, the enrichment region bottom is provided with bottom mud scraper (2), the inclined tube of inclined tube disengaging zone (6) adopts and 60 °～80 ° inclination angles of horizontal direction, water leg (7) influent weir is a trilateral, and back coagulation basin is provided with the back coagulation agitator (5) of variable-ratio.

3, according to described steel iron wastewater coagulating sedimentation of claim 1 and filtration treatment system, it is characterized in that: distributing trough (15) wall of filtering basin (25) is provided with aperture, aperture is arranged horizontally, and be positioned at more than the backwash water surface, the sand filter blanket (18) of filtering basin (25) is single homogeneous quartz sand filter media, rising pipe is equipped with automatic adjusting electrically-controlled valve after the filter of filtering basin (25) to the pipeline section of trapped well (17), it is chain with the preceding liquid level of filter, can realize the filtration of position, Hengshui by adjusting discharge, the back flushing water pipe (14) of filtering basin combines with back flushing tracheae (19), adopt the three step irrigations of " first gas back flushing; gas again; water back flushing simultaneously, last water backwashing ".

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